How to use

getExecutionPlan

method

in

org.apache.flink.streaming.api.environment.StreamExecutionEnvironment

@Test
@SuppressWarnings("unchecked")
public void testFromCollectionParallelism() {
  try {
    TypeInformation<Integer> typeInfo = BasicTypeInfo.INT_TYPE_INFO;
    StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
    DataStreamSource<Integer> dataStream1 = env.fromCollection(new DummySplittableIterator<Integer>(), typeInfo);
    try {
      dataStream1.setParallelism(4);
      fail("should throw an exception");
    }
    catch (IllegalArgumentException e) {
      // expected
    }
    dataStream1.addSink(new DiscardingSink<Integer>());
    DataStreamSource<Integer> dataStream2 = env.fromParallelCollection(new DummySplittableIterator<Integer>(),
        typeInfo).setParallelism(4);
    dataStream2.addSink(new DiscardingSink<Integer>());
    env.getExecutionPlan();
    assertEquals("Parallelism of collection source must be 1.", 1, env.getStreamGraph().getStreamNode(dataStream1.getId()).getParallelism());
    assertEquals("Parallelism of parallel collection source must be 4.",
        4,
        env.getStreamGraph().getStreamNode(dataStream2.getId()).getParallelism());
  }
  catch (Exception e) {
    e.printStackTrace();
    fail(e.getMessage());
  }
}

String plan = env.getExecutionPlan();

public String dumpExecutionPlan() throws Exception {
 if (batchEnv != null) {
  return batchEnv.getExecutionPlan();
 } else {
  return streamEnv.getExecutionPlan();
 }
}

System.out.println(env.getExecutionPlan());
env.execute();